When Blood Calcium Levels Fall, Which of the Following Does

question 79

Multiple Choice

When blood calcium levels fall, which of the following does NOT occur?

• A) PTH is produced and activates vitamin D.
• B) Vitamin D stimulates the kidney to reabsorb calcium from the blood.
• C) PTH and vitamin D stimulate osteoblasts to break down bone.
• D) Vitamin D increases the absorption of calcium from the intestines.

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Definitions:

Potential Difference

Difference in electrical potential, measured as the charge difference across the plasma membrane.

Hyperpolarization

An increase in a cell's membrane potential, making it more negative and less likely to fire an action potential.

Voltage-Gated

Pertaining to ion channels that open or close in response to changes in membrane potential, crucial for nerve impulse conduction.

Na+

Na+ represents Sodium ions, which are essential electrolytes in the body that help maintain blood pressure, fluid balance, and are critical for the functioning of muscles and nerves.